CN113098066A - Power adjusting method, power adjusting device and terminal equipment - Google Patents
Power adjusting method, power adjusting device and terminal equipment Download PDFInfo
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- CN113098066A CN113098066A CN202110486112.2A CN202110486112A CN113098066A CN 113098066 A CN113098066 A CN 113098066A CN 202110486112 A CN202110486112 A CN 202110486112A CN 113098066 A CN113098066 A CN 113098066A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention is suitable for the field of photovoltaic power generation, and provides a power adjusting method, a power adjusting device and terminal equipment. The photovoltaic energy storage off-grid system comprises an energy storage converter, a photovoltaic converter, an alternating current bus, a battery pack and a battery management unit, wherein the energy storage converter is used for alternating current-direct current conversion and supplying power to the battery pack or the alternating current bus; the battery management unit is used for managing charging and discharging of the battery pack; the photovoltaic converter is used for converting photovoltaic electric energy into alternating current to supply to the alternating current bus. When the photovoltaic energy storage off-grid system is unbalanced in power due to sudden load change or energy storage converter failure and the like, the output frequency of the energy storage converter to the alternating current bus is adjusted to change the alternating current frequency of the bus, and the photovoltaic converter responds to the alternating current frequency of the bus to adjust the photovoltaic output power of the photovoltaic converter. Compared with the method for realizing power scheduling by adopting an energy management system in the prior art, the method is self-adaptive control and has the characteristics of simple and convenient control, low cost and quick response.
Description
Technical Field
The invention belongs to the technical field of photovoltaic power generation, and particularly relates to a power adjusting method, a power adjusting device and terminal equipment in a photovoltaic energy storage off-grid system.
Background
The photovoltaic energy storage off-grid system is widely applied to application places such as remote mountainous areas, non-electricity areas, islands, communication base stations, street lamps and the like. The photovoltaic energy storage off-grid System comprises a Battery pack, a Battery Management System (BMS), an energy storage converter (PCS), an alternating current bus, a photovoltaic array and a photovoltaic converter (SPI), a load and other devices. The photovoltaic square matrix and the photovoltaic converter form a power generation part of the system, and when illumination exists, the photovoltaic converter outputs electric energy generated by the photovoltaic square matrix to an alternating current bus of the system in an alternating current mode. The energy storage converter PCS, the battery pack and the BMS form an energy storage part, the energy storage converter receives electric energy on an alternating current bus of the system and then charges the battery pack, or the electric energy stored in the battery pack is output to the alternating current bus of the system in an alternating current mode to supply power to a load. The load part is an alternating current load, and when the load part is used, electric energy is obtained from an alternating current bus. During system operation, problems of sudden load change, battery charging current limitation or PCS fault and the like often occur, and the total photovoltaic output power may exceed the bearing range of the PCS, so that the stability of the photovoltaic energy storage off-grid system is affected.
At present, an Energy Management System (EMS) is added in a photovoltaic Energy storage off-grid System, and the EMS System is adopted to perform power scheduling on a photovoltaic converter, so that the total photovoltaic output power is within the bearing range of the Energy storage converter.
However, the addition of the EMS system results in a significant increase in the cost of the photovoltaic energy storage off-grid system. In addition, a large amount of additional scheduling communication data are added, so that the scheduling speed of the photovoltaic energy storage off-grid system is low and the stability of the system is poor.
Disclosure of Invention
In view of this, embodiments of the present invention provide a power adjustment method, a power adjustment apparatus, and a terminal device, so as to solve the problems of high cost, low speed, and low efficiency in power adjustment of a photovoltaic energy storage off-grid system in the prior art.
The first aspect of the embodiment of the invention provides a power regulation method, which is used for a photovoltaic energy storage off-grid system, wherein the photovoltaic energy storage off-grid system comprises an energy storage converter, a photovoltaic converter, an alternating current bus, a battery pack and a battery management unit, the energy storage converter is used for converting alternating current at one side of the alternating current bus into direct current to be transmitted to the battery pack or converting direct current output at one side of the battery pack into alternating current to be supplied to the alternating current bus, the battery management unit is used for charge and discharge management of the battery pack, and the photovoltaic converter is used for converting photovoltaic electric energy into alternating current to be supplied; the power regulation method is applied to an energy storage converter and comprises the following steps:
acquiring the output power of the energy storage converter to an alternating current bus;
acquiring a charging limiting current set by a battery management unit;
and adjusting the output frequency of the energy storage converter to the alternating current bus according to the output power and the charging limiting current, so that the alternating current bus responds to the output frequency to adaptively adjust the bus alternating current frequency of the alternating current bus, and the photovoltaic converter responds to the bus alternating current frequency to adjust the photovoltaic output power of the photovoltaic converter.
Based on the first aspect, in a first implementation manner, the adjusting the output frequency of the energy storage converter to the alternating current bus according to the output power and the charging limiting current includes:
acquiring adjusting parameters, wherein the adjusting parameters comprise rated frequency, droop frequency, rated power of an energy storage converter, direct current rated current of the energy storage converter and droop coefficient of the photovoltaic converter of the photovoltaic energy storage off-grid system;
the droop frequency refers to the frequency deviation required by the change of the output power of the energy storage converter from 0 to the rated power of the energy storage converter, and the droop coefficient of the photovoltaic converter refers to the frequency deviation required by the reduction of the output power of the photovoltaic converter from the beginning to 0;
adjusting the output frequency of the energy storage converter to the alternating current bus according to the output power, the charging limiting current, the adjusting parameter and a specified frequency adjusting rule;
wherein the frequency adjustment rule comprises:
wherein f isoutFor the output frequency, f, of the energy-storing converterrateRated frequency, f, for photovoltaic energy storage off-grid systemsdroopFor drooping frequency, PoutFor output power of energy-storing converters, PrateFor rated power of energy-storing converters, IrateFor dc rated current of energy-storing converters, IChargeLimitLimiting the charging current from the battery management unit when the charging limiting current is IrateWhen the charging is performed, the charging is performed according to the rated current, when the charging limiting current is 0, the charging is stopped, fspidroopAnd the droop coefficient of the photovoltaic converter.
Based on the first possible implementation manner of the first aspect, in a second possible implementation manner, the adaptively adjusting, by the ac bus in response to the output frequency, the bus ac frequency of the ac bus itself includes:
the AC bus responds to the output frequency to adaptively adjust its own bus AC frequency to be consistent with the output frequency.
A second aspect of the embodiments of the present invention provides a power adjustment method, which is used for a photovoltaic energy storage off-grid system, where the photovoltaic energy storage off-grid system includes an energy storage converter, a photovoltaic converter, an ac bus, a battery pack, and a battery management unit, where the energy storage converter is used to convert ac power at one side of the ac bus into dc power and transmit the dc power to the battery pack, or convert dc power output at one side of the battery pack into ac power and supply the ac power to the ac bus, the battery management unit is used for charge and discharge management of the battery pack, and the photovoltaic converter is used to convert photovoltaic electric energy into ac; the power regulation method is applied to a photovoltaic converter, and comprises the following steps:
obtaining the droop initial frequency of the photovoltaic converter;
comparing the sum of the droop starting frequency and the rated frequency of the photovoltaic energy storage off-grid system with the bus alternating-current frequency of the alternating-current bus;
if the sum of the droop initial frequency and the rated frequency of the photovoltaic energy storage off-grid system is greater than the bus alternating-current frequency, the photovoltaic output power of the photovoltaic converter is adjusted to operate by taking the rated power of the photovoltaic converter as the maximum output power;
if the sum of the droop starting frequency and the rated frequency of the photovoltaic energy storage off-grid system is not greater than the bus alternating-current frequency, adjusting the photovoltaic output power of the photovoltaic energy storage off-grid system based on the droop starting frequency, the rated power of the photovoltaic converter and a preset power adjustment rule;
and the alternating current bus responds to the output frequency of the energy storage converter to adaptively adjust the bus alternating current frequency of the alternating current bus.
Based on the second aspect of the embodiments of the present application, in a first implementation manner, the power adjustment rule includes:
wherein, PoutmaxFor maximum output power, P, of the photovoltaic converterspirateRated power of the photovoltaic converter, fgridFor bus AC frequency, fdroopstartThe droop starting frequency of the photovoltaic converter is set;
a third aspect of the embodiments of the present invention provides a power adjusting apparatus, which is used for a photovoltaic energy storage off-grid system, where the photovoltaic energy storage off-grid system includes an energy storage converter, a photovoltaic converter, an ac bus, a battery pack, and a battery management unit, where the energy storage converter is used to convert ac power at one side of the ac bus into dc power and transmit the dc power to the battery pack, or convert dc power output at one side of the battery pack into ac power and supply the ac power to the ac bus, the battery management unit is used for charge and discharge management of the battery pack, and the photovoltaic converter is used to convert photovoltaic electric energy into ac; applied to energy storage converter, power adjusting device includes:
the output power acquisition unit is used for acquiring the output power of the energy storage converter to the alternating current bus;
a limiting current obtaining unit for obtaining the charging limiting current set by the battery management unit;
the power adjusting unit is used for adjusting the output frequency of the energy storage converter to the alternating current bus according to the output power and the charging limiting current; the alternating current bus responds to the output frequency to adaptively adjust the bus alternating current frequency of the alternating current bus, and the photovoltaic converter responds to the bus alternating current frequency to adjust the photovoltaic output power of the photovoltaic converter.
Based on the third aspect of the embodiments of the present application, in a first implementation manner, the power adjusting apparatus further includes:
the parameter acquiring unit is used for acquiring adjusting parameters, and the adjusting parameters comprise rated frequency of a photovoltaic energy storage off-grid system, droop frequency, rated power of an energy storage converter, direct current rated current and droop coefficient of the photovoltaic converter; the droop frequency refers to the frequency deviation required by the change of the output power of the energy storage converter from 0 to the rated power of the energy storage converter, and the droop coefficient of the photovoltaic converter refers to the frequency deviation required by the reduction of the output power of the photovoltaic converter from the beginning to 0;
the power adjusting unit is specifically configured to adjust the output frequency of the energy storage converter to the ac bus according to the output power, the charging limiting current, the adjusting parameter, and a specified frequency adjusting rule;
wherein the frequency adjustment rule comprises:
wherein f isoutFor the output frequency, f, of the energy-storing converterrateIs a photovoltaicRated frequency, f, of energy storage off-grid systemdroopFor drooping frequency, PoutFor output power of energy-storing converters, PrateFor rated power of energy-storing converters, IrateFor dc rated current of energy-storing converters, IChargeLimitLimiting the charging current from the battery management unit when the charging limiting current is IrateWhen the charging is performed, the charging is performed according to the rated current, when the charging limiting current is 0, the charging is stopped, fspidroopAnd the droop coefficient of the photovoltaic converter.
A fourth aspect of the embodiments of the present invention provides a power adjusting apparatus, configured to be used in a photovoltaic energy storage off-grid system, where the photovoltaic energy storage off-grid system includes an energy storage converter, a photovoltaic converter, an ac bus, a battery pack, and a battery management unit, where the energy storage converter is configured to convert ac power at one side of the ac bus into dc power and transmit the dc power to the battery pack, or convert dc power output at one side of the battery pack into ac power and supply the ac power to the ac bus, the battery management unit is configured to perform charge and discharge management on the battery pack, and the photovoltaic converter is configured to convert photovoltaic electric energy into; for a photovoltaic converter, the power conditioning apparatus comprising:
the droop initial frequency acquisition unit is used for acquiring the droop initial frequency of the photovoltaic converter;
the comparison unit is used for comparing the sum of the droop initial frequency and the rated frequency of the photovoltaic energy storage off-grid system with the bus alternating-current frequency of the alternating-current bus;
the photovoltaic output power adjusting unit is used for adjusting the photovoltaic maximum output power of the photovoltaic converter to operate at the rated power of the photovoltaic converter if the sum of the droop starting frequency and the rated frequency of the photovoltaic energy storage off-grid system is greater than the bus alternating-current frequency; if the sum of the droop starting frequency and the rated frequency of the photovoltaic energy storage off-grid system is not greater than the bus alternating-current frequency, adjusting the photovoltaic maximum output power of the photovoltaic energy storage off-grid system based on the droop starting frequency, the rated power of the photovoltaic converter and a preset power adjusting rule;
and the alternating current bus responds to the output frequency of the energy storage converter to adaptively adjust the bus alternating current frequency of the alternating current bus.
A fifth aspect of the embodiments of the present invention provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the power adjustment method according to any one of the foregoing implementation manners of the first aspect or any one of the foregoing implementation manners of the second aspect when executing the computer program.
A sixth aspect of the embodiments of the present invention provides a photovoltaic energy storage off-grid system, including an energy storage converter, a photovoltaic converter, an ac bus, a battery pack, a battery management unit, and the terminal device of the fifth aspect; the energy storage converter is controlled by terminal equipment.
A seventh aspect of the embodiments of the present invention provides a computer-readable storage medium, which stores a computer program, and the computer program, when executed by a processor, implements the steps of the power adjusting method according to any one of the implementations of the first aspect or the implementations of the second aspect.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: according to the scheme, the output frequency of the energy storage converter is controlled by detecting the output power of the energy storage converter and the charging limiting current sent by the battery management unit, and the photovoltaic converter responds to the output frequency to adjust the output power of the energy storage converter, so that the purpose of power self-adaptive control is achieved. Therefore, the scheme utilizes the energy storage converter and the photovoltaic converter to respectively and directly respond to the change of the output power and the alternating current frequency of the bus, reduces communication data among equipment, improves the response speed and the system stability of the photovoltaic energy storage off-grid system when the photovoltaic energy storage off-grid system faces the problems of sudden load change and the like, and on the other hand, also saves the overall cost of the photovoltaic energy storage off-grid system.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic system structure diagram of a photovoltaic energy storage off-grid system provided by an embodiment of the invention;
fig. 2 is a schematic flow chart of an implementation of a power regulation method applied to an energy storage converter according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of an implementation of a power regulation method applied to a photovoltaic converter according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power conditioning device applied to an energy storage converter according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a power conditioning device applied to a photovoltaic converter according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, a system structure schematic diagram of a photovoltaic energy storage off-grid system provided in an embodiment of the present invention is shown. 101 is a photovoltaic converter (SPI), one side of which is connected to a photovoltaic cell, the photovoltaic cell generating electric energy, the other side of which is connected to an ac bus, the photovoltaic converter converting the photovoltaic electric energy into ac Power for the ac bus; 102 is a Battery pack and Battery Management unit (BMS) for storing electrical energy; 103 is a Power Conversion System (PCS) converter, which is used to convert the ac Power at one side of the ac bus into dc Power and transmit the dc Power to the battery pack, or convert the dc Power output at one side of the battery pack into ac Power and supply the ac Power to the ac bus; the alternating current bus is used for connecting all parts; the right side is the load portion.
Referring to fig. 2, it shows a schematic implementation flow diagram of the power regulation method applied to the energy storage converter provided in the embodiment of the present application, and details are as follows:
step S201, acquiring output power of an energy storage converter to an alternating current bus;
in the embodiment of the application, the direct current side of the energy storage converter is connected with the battery management unit, the alternating current side of the energy storage converter is connected with the alternating current bus, the energy storage converter can be regarded as a voltage source in a system, and when load change or other conditions occur, output power change is caused by current change, so that an output power value and the change condition of the output power value can be obtained by detecting the change of the current. When the battery management unit is in a charging state, the energy storage converter is in a rectifying working state, rectified direct current flows to one side of the battery pack from the end of the energy storage converter, and the output power is a negative value at the moment; when the battery management unit is in a discharging state, the energy storage converter is in an inversion state, current flows from one side of the battery pack to the energy storage converter, electric energy is transmitted from one side of the battery pack to the alternating current bus, and at the moment, the output power is a positive value.
Step S202, acquiring a charging limiting current set by a battery management unit;
in the embodiment of the application, the charging limiting current is sent to the energy storage converter by the battery management unit to prevent the battery pack from being continuously charged after being fully charged in a high charge state, and the symbol I is usedChargeLimitAnd (4) showing. When the battery pack is in a State of insufficient charge (SOC) at a low value, the charging limiting current sent by the battery management unit will not be less than the dc rated current, i.e. the charging current of the battery pack will not be limited. When the battery pack is about to be fully charged or is in a full-charge state, the charging limiting current sent by the battery management unit is reduced, and the charging current of the battery pack is limited. For example when the battery pack is finishedWhen the battery pack is fully charged, the battery management unit sends out charging limiting current of 0, the charging current is also limited to 0, and the battery pack is not charged any more.
Step S203, adjusting the output frequency of the energy storage converter to the alternating current bus according to the output power and the charging limiting current, so that the alternating current bus responds to the output frequency to adaptively adjust the bus alternating current frequency of the alternating current bus, and the photovoltaic converter responds to the bus alternating current frequency to adjust the photovoltaic output power of the photovoltaic converter.
In the embodiment of the application, the output frequency of the energy storage converter to the alternating current bus is adjusted according to the output power and the charging limiting current.
Firstly, obtaining adjusting parameters, wherein the adjusting parameters comprise rated frequency, droop frequency, rated power of an energy storage converter, direct current rated current of the energy storage converter and droop coefficient of the photovoltaic converter of the photovoltaic energy storage off-grid system.
The droop frequency refers to the frequency deviation required by the change of the output power of the energy storage converter from 0 to the rated power of the energy storage converter, and the droop coefficient of the photovoltaic converter refers to the frequency deviation required by the reduction of the output power of the photovoltaic converter from the beginning to 0;
and secondly, adjusting the output frequency of the energy storage converter to the alternating current bus according to the output power, the charging limiting current, the adjusting parameter and a specified frequency adjusting rule.
Wherein the frequency adjustment rule comprises:
wherein f isoutFor the output frequency, f, of the energy-storing converterrateRated frequency, f, for photovoltaic energy storage off-grid systemsdroopFor drooping frequency, PoutFor output power of energy-storing converters, PrateFor rated power of energy-storing converters, IrateFor dc rated current of energy-storing converters, IChargeLimitCharging for battery management unitLimiting the current electrically when the charging limiting current is IrateWhen the charging is performed, the charging is performed according to the rated current, when the charging limiting current is 0, the charging is stopped, fspidroopAnd the droop coefficient of the photovoltaic converter.
It is also noted that the output power P of the energy storage converter is definedoutThe output power is 0 when the battery pack is not charged and discharged. For the charging limiting current, if Irate-IChargeLimit<0 is regarded as Irate-IChargeLimit＝0。
According to the formula, when the load is reduced or part of the energy storage converter fails, namely the absolute value of the output power of the energy storage converter is increased in the charging state,
the output frequency of the energy storage converter is increased; when the battery pack is about to be fully charged, the charging limiting current is reduced, and the output frequency of the energy storage converter is increased accordingly.
In the embodiment of the invention, after the output frequency of the energy storage converter to the alternating current bus is changed, the alternating current bus responds to the output frequency of the energy storage converter to the alternating current bus to adaptively adjust the bus alternating current frequency of the alternating current bus; the photovoltaic converter responds to the bus alternating current frequency, and the bus alternating current frequency adjusts the photovoltaic maximum output power of the photovoltaic converter;
when only one energy storage converter is available, the alternating current bus responds to the output frequency of the energy storage converter to adjust the self bus alternating current frequency to be consistent with the output frequency of the energy storage converter in a self-adaptive mode.
If a plurality of energy storage converters exist in the system, the output frequency of the energy storage converters affects the alternating current frequency of the bus, and finally, the alternating current frequency of the bus can be regarded as the output frequency balance result of each energy storage converter.
For example, if the output power of two energy storage converters in the system is the same, one of the two energy storage converters has an output frequency of 49Hz, and the other energy storage converter has an output frequency of 51Hz, the ac frequency of the bus should be 50 Hz.
Referring to fig. 3, it shows a schematic implementation flow diagram of the power regulation method applied to the photovoltaic converter provided in the embodiment of the present application, and details are as follows:
step S301, obtaining the droop initial frequency of the photovoltaic converter.
And if the bus alternating current frequency exceeds the sum of the rated frequency of the photovoltaic energy storage off-grid system and the droop starting frequency, the output power of the photovoltaic converter is over high, and at the moment, the maximum output power curve of the photovoltaic converter sags. In practical application, the droop starting frequency of the photovoltaic converter is related to the actual field situation and is preset according to the system configuration.
Step S302, judging whether the sum of the droop initial frequency and the rated frequency of the photovoltaic energy storage off-grid system is greater than the bus alternating-current frequency of the alternating-current bus or not.
Step S303, if the sum of the droop starting frequency and the rated frequency of the photovoltaic energy storage off-grid system is greater than the bus alternating-current frequency, adjusting the photovoltaic maximum output power of the photovoltaic converter to be the rated power of the photovoltaic converter, and it needs to be pointed out that the actual output power of the photovoltaic converter may not reach the rated power of the photovoltaic converter due to external illumination or temperature and the like in the photovoltaic energy storage off-grid system.
Step S304, if the sum of the droop initial frequency and the rated frequency of the photovoltaic energy storage off-grid system is not more than the bus alternating current frequency, adjusting the photovoltaic output power of the photovoltaic energy storage off-grid system based on the droop initial frequency, the rated power of the photovoltaic converter and a preset power adjusting rule, wherein the preset power adjusting rule is that
Wherein, PoutmaxFor maximum output power, P, of the photovoltaic converterspirateRated power of the photovoltaic converter, fgridFor bus AC frequency, fdroopstartIs a photovoltaicDroop starting frequency of the converter;
when the bus AC frequency fgridIs frate+fdroopstartWhen is, PoutmaxThe maximum output power of the photovoltaic converter is the rated power of the photovoltaic converter. If the alternating current frequency of the bus is continuously increased, it is easy to see that the maximum output power of the photovoltaic converter is gradually reduced.
When the energy storage converter receives the charging forbidding (namely the charging limiting current I) of the battery management unitChargeLimit0), the output frequency f of the energy storage converter can be known according to the regulation rule of the output frequency of the energy storage converteroutIs frate+fdroop+fspidroopDroop frequency f of energy storage converterdroopDroop starting frequency f of photovoltaic converterdroopstartPreset and can be set to the same value, at the moment, the bus AC frequency fgridFollowing the output frequency of the energy storage converter to frate+fdroopstart+fspidroopAnd combining the regulation rule of the photovoltaic output power of the photovoltaic converter, wherein the maximum output power P of the photovoltaic converter is obtained at the momentoutmaxWhen the output power of the energy storage converter is reduced to 0, the output power of the energy storage converter is also 0 correspondingly. And the alternating current frequency of the bus is reduced, the maximum output power of the photovoltaic converter is increased again, the output power of the energy storage converter is correspondingly increased, and the photovoltaic energy storage off-grid system is finally in a stable state.
Therefore, the frequency change can be controlled by the law, the maximum output power of the photovoltaic can be adjusted, and the situation of power change caused by sudden load change and the like can be processed.
The embodiment of the application has been actually tested, the test is based on a photovoltaic energy storage off-grid system platform consisting of 2 250kw energy storage converters, 7 60kw photovoltaic converters and the like, the power response time of the photovoltaic converters can be verified to be within 200ms, and the adjustment time (within 2% of voltage fluctuation) can be controlled to be within 500 ms. If adopt the EMS system to adjust under the same platform, can lead to photovoltaic energy storage off-grid system overload warning.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The following are apparatus embodiments of the present application, and for details not described in detail therein, reference may be made to the corresponding method embodiments described above.
Referring to fig. 4, a schematic structural diagram of a power conditioning device according to an embodiment of the present invention is shown, which is detailed as follows:
the power conditioning apparatus includes: an output power acquisition unit 401, a limiting current acquisition unit 402 and a power adjustment unit 403.
The output power obtaining unit 401 is configured to obtain output power of the energy storage converter to the ac bus, specifically, the voltage is constant, and the output power of the energy storage converter can be obtained by measuring a change value of the current;
a limited current acquiring unit 402 for acquiring a charging limited current set by the battery management unit;
a power adjusting unit 403, configured to adjust an output frequency of the energy storage converter to the ac bus according to the output power and the charging limiting current; the alternating current bus responds to the output frequency to adaptively adjust the bus alternating current frequency of the alternating current bus, and the photovoltaic converter responds to the bus alternating current frequency to adjust the photovoltaic output power of the photovoltaic converter.
Optionally, the power adjusting apparatus may further include:
the parameter acquiring unit is used for acquiring adjusting parameters, and the adjusting parameters comprise rated frequency of a photovoltaic energy storage off-grid system, droop frequency, rated power of an energy storage converter, direct current rated current of the energy storage converter and droop coefficient of the photovoltaic converter; the droop frequency refers to the frequency deviation required by the change of the output power of the energy storage converter from 0 to the rated power of the energy storage converter, and the droop coefficient of the photovoltaic converter refers to the frequency deviation required by the reduction of the output power of the photovoltaic converter from the beginning to 0;
the power adjusting unit is specifically configured to adjust the output frequency of the energy storage converter to the ac bus according to the output power, the charging limiting current, the adjusting parameter, and a specified frequency adjusting rule;
wherein the frequency adjustment rule comprises:
wherein f isoutFor the output frequency, f, of the energy-storing converterrateRated frequency, f, for photovoltaic energy storage off-grid systemsdroopFor drooping frequency, PoutFor output power of energy-storing converters, PrateFor rated power of energy-storing converters, IrateFor dc rated current of energy-storing converters, IChargeLimitLimiting the charging current from the battery management unit when the charging limiting current is IrateWhen the charging is performed, the charging is performed according to the rated current, when the charging limiting current is 0, the charging is stopped, fspidroopAnd the droop coefficient of the photovoltaic converter.
Fig. 5 shows a schematic structural diagram of a power conditioning device applied to a photovoltaic converter according to an embodiment of the present invention, which is detailed as follows:
the power conditioning apparatus includes: a droop starting frequency obtaining unit 501, a comparing unit 502 and a photovoltaic output power adjusting unit 503.
A droop starting frequency obtaining unit 501, configured to obtain a droop starting frequency of the photovoltaic converter;
a comparing unit 502, configured to compare the sum of the droop starting frequency and a rated frequency of the photovoltaic energy storage off-grid system with a bus ac frequency of an ac bus;
the photovoltaic output power adjusting unit 503 is configured to adjust the maximum photovoltaic output power of the photovoltaic converter to operate at the rated power of the photovoltaic converter if the sum of the droop starting frequency and the rated frequency of the photovoltaic energy storage off-grid system is greater than the bus ac frequency, where it is noted that the actual output power of the photovoltaic converter may not reach the rated power of the photovoltaic converter due to external illumination or temperature and the like in the photovoltaic energy storage off-grid system;
if the sum of the droop starting frequency and the rated frequency of the photovoltaic energy storage off-grid system is not greater than the bus alternating-current frequency, adjusting the photovoltaic maximum output power of the photovoltaic energy storage off-grid system based on the droop starting frequency, the rated power of the photovoltaic converter and a preset power adjusting rule;
and the alternating current bus responds to the output frequency of the energy storage converter to adaptively adjust the bus alternating current frequency of the alternating current bus.
In one embodiment, the power adjustment rule may include:
wherein, PoutmaxFor maximum output power, P, of the photovoltaic converterspirateRated power of the photovoltaic converter, fgridFor bus AC frequency, fdroopstartFor the sag starting frequency, f, of the photovoltaic converterrateAnd the rated frequency of the photovoltaic energy storage off-grid system is obtained.
In conclusion, the output frequency of the energy storage converter is controlled by detecting the output power and the charging limiting current of the energy storage converter, and the photovoltaic converter responds to the output frequency to adjust the output power of the energy storage converter, so that the purpose of self-adaptive control of the power is achieved. Therefore, the converter is used for directly responding to the change of the output power and the alternating current frequency of the bus, communication data among equipment are reduced, the response speed and the system stability of the photovoltaic energy storage off-grid system in the face of the problems of sudden load change and the like are improved, and on the other hand, the overall cost of the photovoltaic energy storage off-grid system is saved.
Fig. 6 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 5, the terminal device 6 of this embodiment includes: a processor 60, a memory 61 and a computer program 62 stored in said memory 61 and executable on said processor 60. The processor 60, when executing the computer program 62, implements the steps in the various power adjustment method embodiments described above, such as steps 201 through 203 shown in fig. 2. Alternatively, the processor 60, when executing the computer program 62, implements the functions of the units in the above-described device embodiments, such as the functions of the units 501 to 503 shown in fig. 5.
Illustratively, the computer program 62 may be divided into one or more units, which are stored in the memory 61 and executed by the processor 60 to accomplish the present invention. The one or more units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 62 in the terminal device 6. For example, the computer program 62 may be divided into an output power obtaining unit 401, a limiting current obtaining unit 402 and a power adjusting unit 403, and the specific functions of each unit are as follows:
the output power obtaining unit 401 is configured to obtain output power of the energy storage converter to the ac bus, specifically, the voltage is constant, and the output power of the energy storage converter can be obtained by measuring a change value of the current;
a limited current acquiring unit 402 for acquiring a charging limited current set by the battery management unit;
a power adjusting unit 403, configured to adjust an output frequency of the energy storage converter to the ac bus according to the output power and the charging limiting current; the alternating current bus responds to the output frequency to adaptively adjust the bus alternating current frequency of the alternating current bus, and the photovoltaic converter responds to the bus alternating current frequency to adjust the photovoltaic output power of the photovoltaic converter.
The terminal device 6 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor 60, a memory 61. Those skilled in the art will appreciate that fig. 6 is merely an example of a terminal device 6 and does not constitute a limitation of terminal device 6 and may include more or less components than those shown, or some components in combination, or different components, for example, the terminal device may also include input output devices, network access devices, buses, etc.
The Processor 60 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 61 may be an internal storage unit of the terminal device 6, such as a hard disk or a memory of the terminal device 6. The memory 61 may also be an external storage device of the terminal device 6, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 6. Further, the memory 61 may also include both an internal storage unit and an external storage device of the terminal device 6. The memory 61 is used for storing the computer program and other programs and data required by the terminal device. The memory 61 may also be used to temporarily store data that has been output or is to be output.
The embodiment of the invention provides a photovoltaic energy storage off-grid system, which comprises an energy storage converter, a photovoltaic converter, an alternating current bus, a battery pack, a battery management unit and the terminal equipment; the energy storage converter is controlled by terminal equipment.
It will be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional units is merely illustrated, and in practical applications, the above distribution of functions may be performed by different functional units according to needs, that is, the internal structure of the apparatus may be divided into different functional units to perform all or part of the functions described above. Each functional unit in the embodiments may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units are only used for distinguishing one functional unit from another, and are not used for limiting the protection scope of the application. The specific working process of the units in the system may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. . Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A power regulation method is used for a photovoltaic energy storage off-grid system, the photovoltaic energy storage off-grid system comprises an energy storage converter, a photovoltaic converter, an alternating current bus, a battery pack and a battery management unit, the energy storage converter is used for converting alternating current on one side of the alternating current bus into direct current to be transmitted to the battery pack or converting direct current output on one side of the battery pack into alternating current to be supplied to the alternating current bus, the battery management unit is used for charge and discharge management of the battery pack, and the photovoltaic converter is used for converting photovoltaic electric energy into alternating current to be supplied to the alternating current; the power regulation method is applied to the energy storage converter, and comprises the following steps:
acquiring the output power of the energy storage converter to an alternating current bus;
acquiring a charging limiting current set by a battery management unit;
and adjusting the output frequency of the energy storage converter to the alternating current bus according to the output power and the charging limiting current, so that the alternating current bus responds to the output frequency to adaptively adjust the bus alternating current frequency of the alternating current bus, and the photovoltaic converter responds to the bus alternating current frequency to adjust the photovoltaic output power of the photovoltaic converter.
2. The power conditioning method of claim 1 wherein said regulating the output frequency of the energy storage converter to the ac bus based on the output power and the charge limiting current comprises:
acquiring adjusting parameters, wherein the adjusting parameters comprise rated frequency, droop frequency, rated power of an energy storage converter, direct current rated current of the energy storage converter and droop coefficient of the photovoltaic converter of the photovoltaic energy storage off-grid system;
the droop frequency refers to the frequency deviation required by the change of the output power of the energy storage converter from 0 to the rated power of the energy storage converter; the droop coefficient of the photovoltaic converter refers to the frequency deviation required by the output power of the photovoltaic converter to drop to 0 from the beginning;
adjusting the output frequency of the energy storage converter to the alternating current bus according to the output power, the charging limiting current, the adjusting parameter and a specified frequency adjusting rule;
wherein the frequency adjustment rule comprises:
wherein f isoutFor the output frequency, f, of the energy-storing converterrateRated frequency, f, for photovoltaic energy storage off-grid systemsdroopFor drooping frequency, PoutFor output power of energy-storing converters, PrateFor rated power of energy-storing converters, IrateFor dc rated current of energy-storing converters, IChargeLimitLimiting the charging current from the battery management unit when the charging limiting current is IrateWhen the charging is performed at the rated current, the charging is stopped when the charging limiting current is 0, fspidroopAnd the droop coefficient of the photovoltaic converter.
3. The power conditioning method of claim 2, wherein the ac bus adaptively adjusting the bus ac frequency of the ac bus itself in response to the output frequency comprises:
the AC bus responds to the output frequency to adaptively adjust its own bus AC frequency to be consistent with the output frequency.
4. A power regulation method is used for a photovoltaic energy storage off-grid system, the photovoltaic energy storage off-grid system comprises an energy storage converter, a photovoltaic converter, an alternating current bus, a battery pack and a battery management unit, the energy storage converter is used for converting alternating current on one side of the alternating current bus into direct current to be transmitted to the battery pack or converting direct current output on one side of the battery pack into alternating current to be supplied to the alternating current bus, the battery management unit is used for charge and discharge management of the battery pack, and the photovoltaic converter is used for converting photovoltaic electric energy into alternating current to be supplied to the alternating current; the power regulation method is applied to the photovoltaic converter, and is characterized in that the power regulation method comprises the following steps:
obtaining the droop initial frequency of the photovoltaic converter;
comparing the droop starting frequency with a rated frequency of the photovoltaic energy storage off-grid system and a bus alternating-current frequency of an alternating-current bus;
if the sum of the droop initial frequency and the rated frequency of the photovoltaic energy storage off-grid system is greater than the bus alternating-current frequency, the photovoltaic output power of the photovoltaic converter is adjusted to operate by taking the rated power of the photovoltaic converter as the photovoltaic maximum output power;
if the sum of the droop starting frequency and the rated frequency of the photovoltaic energy storage off-grid system is not greater than the bus alternating-current frequency, adjusting the photovoltaic maximum output power of the photovoltaic energy storage off-grid system based on the droop starting frequency, the rated power of the photovoltaic converter and a preset power adjusting rule;
and the alternating current bus responds to the output frequency of the energy storage converter to adaptively adjust the bus alternating current frequency of the alternating current bus.
5. The power adjustment method of claim 4, wherein the power adjustment rule comprises:
wherein, PoutmaxFor maximum output power, P, of the photovoltaic converterspirateRated power of the photovoltaic converter, fgridFor bus AC frequency, fdroopstartThe droop starting frequency of the photovoltaic converter is shown.
6. A power adjusting device is used for a photovoltaic energy storage off-grid system, the photovoltaic energy storage off-grid system comprises an energy storage converter, a photovoltaic converter, an alternating current bus, a battery pack and a battery management unit, the energy storage converter is used for converting alternating current on one side of the alternating current bus into direct current to be transmitted to the battery pack or converting direct current output on one side of the battery pack into alternating current to be supplied to the alternating current bus, the battery management unit is used for charging and discharging management of the battery pack, and the photovoltaic converter is used for converting photovoltaic electric energy into alternating current to be supplied to the alternating current bus; the power regulating device is characterized by being applied to an energy storage converter, and the power regulating device comprises:
the output power acquisition unit is used for acquiring the output power of the energy storage converter to the alternating current bus;
a limiting current obtaining unit for obtaining the charging limiting current set by the battery management unit;
the power adjusting unit is used for adjusting the output frequency of the energy storage converter to the alternating current bus according to the output power and the charging limiting current; the alternating current bus responds to the output frequency to adaptively adjust the bus alternating current frequency of the alternating current bus, and the photovoltaic converter responds to the bus alternating current frequency to adjust the photovoltaic output power of the photovoltaic converter.
7. The power regulating device as claimed in claim 6, wherein the power regulating device further comprises:
the parameter acquiring unit is used for acquiring adjusting parameters, and the adjusting parameters comprise rated frequency of a photovoltaic energy storage off-grid system, droop frequency, rated power of an energy storage converter, direct current rated current of the energy storage converter and droop coefficient of the photovoltaic converter; the droop frequency refers to the frequency deviation required by the change of the output power of the energy storage converter from 0 to the rated power of the energy storage converter, and the droop coefficient of the photovoltaic converter refers to the frequency deviation required by the reduction of the output power of the photovoltaic converter from the beginning to 0;
the power adjusting unit is specifically configured to adjust the output frequency of the energy storage converter to the ac bus according to the output power, the charging limiting current, the adjusting parameter, and a specified frequency adjusting rule;
wherein the frequency adjustment rule comprises:
wherein f isoutFor the output frequency, f, of the energy-storing converterrateRated frequency, f, for photovoltaic energy storage off-grid systemsdroopFor drooping frequency, PoutFor output power of energy-storing converters, PrateFor rated power of energy-storing converters, IrateFor dc rated current of energy-storing converters, IChargeLimitLimiting the charging current from the battery management unit when the charging limiting current is IrateWhen the charging is performed at the rated current, the charging is stopped when the charging limiting current is 0, fspidroopAnd the droop coefficient of the photovoltaic converter.
8. A terminal device comprising a memory, a processor and a computer program stored in said memory and executable on said processor, characterized in that said processor when executing said computer program implements the steps of the power regulating method as claimed in any one of claims 1 to 3 applied to an energy storage converter or the power regulating method as claimed in any one of claims 4 to 5 applied to a photovoltaic converter.
9. A photovoltaic energy storage off-grid system comprising an energy storage converter, a photovoltaic converter, an ac bus, a battery pack and battery management unit and a terminal device according to claim 8; the energy storage converter is controlled by the terminal equipment.
10. A computer-readable storage medium, in which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method for power regulation as claimed in any one of claims 1 to 3 for an energy storage converter or the method for power regulation as claimed in any one of claims 4 to 5 for a photovoltaic converter.
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